Viessmann Vitodens 200-W Series Installation And Service Instructions Manual page 82

Troubleshooting
Fault codes
(cont.)
Displayed Const.
fault code
E2 X
E3 X
E4 X
E5 X
E6 X
E7 X
E8 X
82
Weath.- System characteris-
comp. tics
X Burner in a fault state Heating water flow
X Burner in a fault state Heat transfer too
X Burner blocked
X Burner blocked
X Burner blocked
X Burner in a fault state Ionisation current
X Burner in a fault state The ionisation cur-
Cause Measures
Ensure adequate circula-
rate too low during tion volume.
calibration. Flow Check flow switch.
switch caused Remove scaling, block-
shutdown. age.
Press reset button R.
Ensure adequate heat
low during calibra- transfer.
tion. Press reset button R.
Temperature limiter
caused shutdown.
Fault, supply volt- Replace control unit.
age 24 V
Fault, flame ampli- Replace control unit.
fier
System pressure Top up with water.
too low
Check ionisation elec-
too low during cali- trode:
bration Distance to burner
■
gauze assembly (see
page 32)
Contamination of elec-
■
trode
Connecting lead and
■
plug-in connections
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button R.
Check gas supply (gas
rent lies outside pressure and gas flow
the permissible switch), gas train and
range connecting lead.
Check allocation of gas
type (see page 26).
Check ionisation elec-
trode:
Distance to burner
■
gauze assembly (see
page 32)
Contamination of elec-
■
trode
Press reset button R.